1) The cameraman needs more training.
2) The knife carrier needs a CCW. His effective range is about 36", and stopping power is very low.
Blade deploying sheaths have been around for decades, notably for the Buck 110. Many gunshow cowboys seem to have one to flick constantly during the dull moments that quickly descend on their lamp and jerky display.
Doing that with kerambits just shows that it can be done. They're a specific defense knife with a dedicated style of use. In other words, a lousy EDC and even worse utility knife, unless you install carpeting. You can buy one, better train diligently for a few years.
On a more practical point, just exactly what does this do that a clipped locking folder can't? In terms of use by the average reasonable man, the incremental increase in ability to defend oneself - if any - can't be exercised. The average guy carrying a knife is a workman, not a trained martial artist with dragons branded into his forearms. A calm demeanor and practiced motions aren't stock in trade against a meth perp.
He's better off with a CCW, most states are shall issue. And if you're doing it right, you won't need it.